<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三级分类进行相关参数设置！" type="warning" :closable="false" show-icon></el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange" clearable>
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开列 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                  class="input-new-tag"
                                  v-if="scope.row.inputVisible"
                                  v-model="scope.row.inputValue"
                                  ref="saveTagInput"
                                  size="small"
                                  @keyup.enter.native="handleInputConfirm(scope.row)"
                                  @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column label="#" type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开列 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                  class="input-new-tag"
                                  v-if="scope.row.inputVisible"
                                  v-model="scope.row.inputValue"
                                  ref="saveTagInput"
                                  size="small"
                                  @keyup.enter.native="handleInputConfirm(scope.row)"
                                  @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column label="#" type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close='addDialogClosed'>
            <!-- 添加分类的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                  <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>    
            <span slot="footer" class="dialog-footer">
              <el-button @click="addDialogVisible = false">取 消</el-button>
              <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 编辑参数的对话框 -->
        <el-dialog :title="'编辑'+titleText" :visible.sync="editDialogVisible" width="50%" @close='editDialogClosed'>
            <!-- 添加分类的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                  <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>    
            <span slot="footer" class="dialog-footer">
              <el-button @click="editDialogVisible = false">取 消</el-button>
              <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script> 
export default {
    data() {
        return {
            //商品分类列表
            catelist: [],
            //级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover',
            },
            //级联选择框双向绑定的数组
            selectedCateKeys: [],
            //被激活的页面标签的名称
            activeName: 'many',
            //动态参数定义数据
            manyTableData: [],
            //静态参数定义数据
            onlyTableData: [],


            //控制添加对话框的一些属性
            addDialogVisible: false,
            addForm: {
                attr_name: ''
            },
            addFormRules: {
                attr_name:[
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },

            //控制编辑对话框的一些属性
            editDialogVisible: false,
            editForm: {},
            editFormRules: {
                attr_name:[
                    {required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },

            
            
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有的商品分类列表
        async getCateList() {
            const {data: res} = await this.$http.get('categories')

            if(res.meta.status !==200) {
                return this.$message.error('获取商品分类失败！')
            }

            this.catelist = res.data
            console.log(this.catelist);
        },
        //级联选择框选中项变化，会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        //tab 页签点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData() {
            //证明选中的不是三级分类
                if (this.selectedCateKeys.length !== 3) {
                    this.selectedCateKeys = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }

                //证明选中的是三级分类
                console.log(this.selectedCateKeys);
                //根据所选分类的Id，和当前所处的面板，获取对应的参数
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: {sel:this.activeName}
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('获取参数列表失败')
                }
                
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
                    //控制文本框的显示与隐藏
                    item.inputVisible = false
                    //文本框中输入的值
                    item.inputValue = ''
                })
                console.log(res.data);
                if(this.activeName === 'many') {
                    this.manyTableData = res.data
                } else {
                    this.onlyTableData = res.data
                }
        },
        //监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const {data: res} =await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                }
                
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
                
            })
        },
        //点击按钮 展开修改按钮的对话框
        async showEditDialog(attr_id) {
            //查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params: {
                    attr_sel: this.activeName
                }
            })

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }

            this.editForm = res.data
            this.editDialogVisible = true
        },
        //监听编辑对话框的关闭事件,重置表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }

                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        //点击按钮，根据ID删除对应的参数
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            //用户取消了删除操作
            if(confirmResult !=='confirm') {
                return this.$message.info('取消了删除！')
            }

            //删除的业务逻辑
            const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }

            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        //文本框失去焦点，或按下 Enter 都会触发
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //如果没有return 则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            //需要发起请求，保存这次操作
            this.saveAttrVals(row)
            
        },
        //将对 attr_vals 的操作，保存到数据库
        async saveAttrVals(row) {
            //需要发起请求，保存这次操作
            const {data: res} =await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(',')
            })

            if(res.meta.status !==200) {
                return  this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        //点击按钮，展示文本输入框
        showInput(row) {
            row.inputVisible = true
            //让文本框自动获得焦点
            //nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        //删除对应的参数可选项
        handleClose(i,row) {
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    //计算属性
    computed: {
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true 
            }
            return false
        },
        //当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt {
    margin-top: 15px;
    margin-bottom: 15px;
}

.el-tag {
    margin: 6px;
}

.input-new-tag{
    width: 135px;
}
</style>